| 摘要 |
In a control circuit for controlling a power transistor included in a power device, the transistor is turned-off when a drop of a control voltage level or overcurrent in the power transistor is detected. Signals for discriminating the overcurrent from the voltage drop are generated and individually outputted from the control circuit, whereby the reason why the transistors were turned-off can be monitored. After a predetermined time period has passed from the overcurrent had been detected, the transistor is automatically turned-on to recover the operation of the transistor. A capacitor for supplying the control power voltage is re-charged during the time period. It is not necessary to carefully determine the on/off timings of the input signal for waiting the recovery of the control power voltage.
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